Time series spectra of a simulated KN (Run3 – DD2 EoS, see Table 1) associated with GW190425 as if observed with MAAT with the OSIRIS R1000B and R1000R grisms for 0.5 h exposure per epoch. Note that the GW190425 event was located around 160 Mpc and with an inclination angle ∼40°. The broad-band SDSS gri magnitudes are also shown, see text, with error corresponding to S/N = 5, we notice that the observations have to be sensitive to 22 mag and deeper to get a detection for this kind of KN. The graph shows the MAAT spectra directly obtained from the ETC (shaded) and the rebinned spectra overplotted with solid line on the same color. Note that this is synthetic data generated for a KN at 159 Mpc and θ = 40°.